How do you unlock pride lands in kingdom hearts 2?

To unlock the Pride Lands in Kingdom Hearts 2, you must first complete the previous worlds and progress through the storyline. After defeating the Heartless in the Hollow Bastion and acquiring the Master Form, you will receive a cutscene that leads you to the world of the Pride Lands. Once you reach the map of the world, you can travel there by selecting it on the Gummi Ship.